Screen rotation lock won't work for landscape mode

For some reason, when I put the phone in landscape mode and enable the rotation lock, it just sets the screen to portrait mode and then locks the rotation. I want to be able to keep the screen in landscape mode, is there a way to do this? I am using a Samsung Galaxy S7, with Android Nougat and the TouchWiz launcher. I am happy to switch to Google Now Launcher if it lets me lock the screen in landscape though.